Pump



v May 30, 1933. M. LA BRIE.

,PUMP

Filed June 14, 1932 ENTOR LA BRl E TTORNEYS INV HOWARD M.

- BY. HIS MM Patented May 30, 1933 entra n rATEn'r caries HOWARD MI. LABRIE, F BOANOKE, VIRGINIA, ASSIGNOR TO THE VISCOSE COMPANY, OF MARCUSHOOK, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PUMP

Application filed June 14,

This invention relates to pumps, and more particularly to devices ofthis, character adapted for pumping viscous liquids, such as the type ofpumps used in the manufacture of artificial silk, for forcing thespinning solution through the spinneret.

v The main object of the invention is to avoid movement of the pumppiston when the cylinder is not in communication with the inlet or'outlet ports.

Other objects are to improve the construction and operation of pumps ofthis character, to render them economical to manufacture, reliable inuse, and otherwise well adapted for the purposes set forth, as will beapparent from the following descri tion in conjunction with theaccompanying rawing, in which Figure 1 is a vertical longitudinalsection through a pump according to the preferred embodiment of thepresent invention;

Figure 2 is a cross-section taken along the line 22 of Figure 1;

Figure 3 is a cross-section taken along the line,33 of Figure 1;

Figure 4 is a'developm'ent of the profile of the novel cam race;

Figure 5 is a partial section taken along the line 5-5. of Figure 3; and

Figure 6 is a gartial section taken along the line 6-6 of igure 3.

The pump comprises a cylindrical pump casing 10 having an inlet 12through which the spinning solution is supplied, and an outlet 14through which the spinning solution is forced to the spinneret. A rotor15 is mounted in the casing 10 and has a shaft 16 extending through thetop of the casing and provided with a gear 17 by means of which therotor is driven. The rotor 15 is longitudinally bored to form apluralityof cylinders 20, five being shown in the present instance,equidistant from and parallel to the axis of the rotor.

As shown in Figure 2, a loading port 22 is formed-inside the casing 10in communication with the inlet 12, and an unloading port 23 isprovided, which communicates with the outlet 14. Each cylinder 20 has apassage 24 extending outwardly therefrom in the an- 1932. Serial No.617,189.

nular plane of the ports 22 and 23. A plunger 25 is snugly fitted ineach of the cylinders 20, and extends downwardly below the bottom of therotor 15.

A hollow cam 26 is secured to the bottom of the casing, and is providedwith a cam race 28, which as shown in Figure 4 has an inclined portion30 corresponding to the loading port, and an oppositely inclined portion31 corresponding to the unloading port. The 60 cam race 28 alsocomprises non-inclined portions 32 and 33, correspondin to the bridgesbetween the ports. The portlons 32 and 33, which are ,not inclined,appear as straight, parallel lines in the development shown in Fi ure 4.i guide post 35 is secured to the bottom of the rotor 15 as by means ofa screw 36, and has a face 37 for each of the pistons of the rotor. Apin 38 prevents relative rotation of 70 the guide post and rotor. In theform shown each face 37 has a slot 39 cut therein, parallel to the axisof the rotor. Radial plunger guide pins 40 are carried by the lower endof each plunger 25. The inner end of each pin40 has a shoe 42 slidablein the groove 38 and the outer end carries a follower 43 received in thecam race 28. In the form shown the cam race is circular in radialsection and the follower 43 is therefore spherical.

The cam 26 is secured to the casing 10 by 1 bolts 45, in such a mannerthat it may be tilted about anaxis through the bolts 45 by means ofadjusting screws 46. This adjustment will vary the inclination of thecam race portions 30 and 31 and thus adjust the stroke of the plungers.

The cam 26 has a cap 50 threaded in the lower portion thereof and thehollow interior of the cam is preferably filled with a suitablelubricant. In order to seal the joint between the casing 10 and the cam26, and permit the tilting adjustment without breaking the seal, a ballface sealing ring 51 is interposed between the casing 10 and the cam 26.1

Means are provided for'discharging any of the material being pumpedwhichmay have leaked past the plunger 25, and thus preventing this materialfrom fouling the lubricant contained inside the cam. For this purpose aslot 52 is cut through the casing 10 into the bore thereof, and a slot53 is cut in the rotor 15 so asto communicate with the cylinder 20associated with each of the plungers 25.

In operation, the rotor 15 being driven by the gear 17 in the directionof the arrow shown in Figure 2, the followers 43 will be driven alongthe cam race 28. As the passage 24 for each cylinder passes the bridgeand communicates with the loading port 22, the follower 43 passes downthe inclined portion 30 of the cam race and thus draws the material tobe pumped into the cylinder 20. As the passage 24 leaves the loadingport 22 and travels around the bridge, the follower 43 rides along thestraight cam race portion 33 and thus is givenno longitudinal movement.As the passage 24 comes into communication with the unloading port 23,the cam follower 43 passes up the inclined cam race portion 31 thusdriving the plunger upward, and forcing the material out through theoutlet 14. During the remaining angle of rotation, the follower 43 ridesalong the cam race portion 32 which is not inclined, and hence gives nolongitudinal movementto the plunger.

lVhile the preferred embodiment of the invention has been disclosed indetail, the invention is not'limited to the details disclosed, butinstead includes such embo'diments thereof as fall within the scope ofthe appended claims.

I claim:

1. In a spinning pump, a casing having inlet and outlet ports withbridges therebetween, a rotor in said casing having cylinderscommunicating successively with said ports and bridges, plungersslidable in said cylinders, a hollow cam having a flange bolted to saidcasing, said cam having a race of substantially circular cross sectioncomprising inclined portions corresponding to said ports,

and non-inclined portions corresponding to said bridges cut into theinner wall thereof and having a greater major diameter than said rotor,a guide post secured to said rotor having slots parallel to saidplungers, and radial members carried by said plungers comprisingsubstantially spherical cam followers received in said race and guideshoes engaging said slots and means for preventing the material beingpumped from passing inside said cam.

2. In a spinning pump, a casing having inlet and outlet ports withbridges therebetween, a rotor in said casing having cylinderscommunicating successively with said ports and bridges, plungersslidable in said cylinders and having cam followers, a hollow cam havinga race receiving said followers and comprising inclined portionscorresponding to said ports and non-inclined portions corresponding tosaid bridges and containing lubricant, a ball faced sealing ringengaging said cam and having a rear surface seated on said casing andretaining said rotor, and adjustment screws for tilting said cam withrespect to said casing on the ball face of said sealing ring about anaxis in an axial plane through said inclined portions and through saidports. z

3. In a spinning pump, a casing having inlet and outlet ports withbridges therebetween, a rotor in said casing having cylinderscommunicating successively with said ports and bridges, plungersslidable in said cylinders and having cam followers, a hollow lubricantcontaining cam secured to said casing and having a race receiving saidfollowers, said race having inclined portions corresponding to saidports and non-inclined portions corresponding to said bridges, a ballfaced sealing ring on said casing, means for tilting said cam on saidball face of said sealing ring, said casing having an open slot betweensaid ports and sealing ring, and said rotor having a registering slotcommunicating with each cylinder, whereby leakage of material beingpumped is prevented from fouling said lubricant.

4. In a spinning pump, a casing having inlet and outlet ports withbridges therebetween, a rotor in said casing having cylinderscommunicating successively with said ports and bridges, plungersslidable in said cylinders and having cam followers, a hollow camassociated with said casing having a race receiving said followers andcomprising in clined portions corresponding to said ports andnon-inclined portions corresponding to said bridges and containinglubricant, means fornsecuring said cam to said casing, means for tiltingsaid cam about said securing means whereby the inclination of the portportions of said race may be varied, sealing means between said cam andeasing permitting said adjustment and preventing escape of lubricant,said casing having an open slot between said ports and said sealingmeans, and said rotor having a registering slot communicating with eachcylinder, whereby leakage of material being pumped is prevented frominterfering with the tilting of said cam on said sealing means, and fromfouling said lubricant. i

5. In a spinning pump, a casing having inlet and outlet ports withbridges therebetween, a rotor in said casing having cylinderscommunicating successively with said ports and bridges, plungersslidable in said cylinders, a hollow cam having a race comprisinginclined portions corresponding to said ports and non-inclined portionscorresponding to said bridges and containing lubricant, adj ustablemeans for securing said cam to said cas ing whereby the inclination ofthe port portions of said race may be varied, and sealing means betweensaid cam and easing permitting said adjustment and preventing escape oflubricant, said sealin means engaging said rotor and retaining sai rotorin said casing. In testimony whereof I have signed my name to thisspecification.

HOWARD M. LA BRIE'

